Gyratory machine.



J. FRASER.

GYRATORY MAGHINE. APlLIoATIoN FILED JUNI: 1s, 1906.

Finca GYRATORY MACHINE.

I Specification of Letters Patent.

Patented Feb.` 1, 1910.

Application filed June 18, 19,06. Serial No. 322.149.

To all lwhom it 'may concern.'

Be it known that I, JoHN FRAsER, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain new and useful Improvements in Gyratory Machines, of which the following is a speci fcation, reference being had to the accompanying drawing, forming a part thereof.

This invention relates to machines such as bolting or screening machines, concentrators and the like, of the class shown and de scribed in United States Letters Patent No. 756,950, dated April 12, 1904, and No. 7 58,907, dated May 3, 1904, which have freely suspended gyratory parts provided with vert-ical eccentrically weighted rotary shafts.

'The main objects of the present invention are to automatically vary the distance of the eccentric weights from the axis of rotation so as to gradually increase and decrease the amplitude or extent of the gyratory movement of the machine in stopping and starting, to quickly bring the moving parts to their normal gyratoly circuit around a fixed axis as they attain normal speed in starting, and to rest in stopping without shock or jar; and generally to improve the construction and operation of machines of this class.

It consists in certain novel features of construction and in the peculiar arrangement and combination of parts as hereinafter particularly described and point-ed out in the claims.

in the accompanying drawing like characters designate the same parts in both figures.

Figure 1 is a central vertical section of a gyratory bolting machine embodying the present invention, the sieves being omitted, and Fig. 2 is a plan view of one of the yielding centrifugal weights for varying and regulating the yratory movement of the machine in stopping and starting.

Referring to Fig. 1, a designates the case or frame of the bolting machine, which is freely suspended by jointed or flexible hangers b from an overhead support c, and is provided at the center with bearings al, for a vertical rotary shaft e. rlhis shaft is pro vided with a pulley f, which is connected by a belt g running on guide pulleys la, attached to the case or frame a, with a suitably located driving pulley, not shown. With the shaft e are connected so as to partake of its rotary movement, one or more weights z', in the present instance one above. and another below the case or frame a. These weights are movable radially or toward and from the shaft e, and their outward movement is opposed by yielding rcsistances, in the pres.- ent instance springs j connecting said weights with the inner ends ofV horizontal frames or arms L', which support them and are fixed on the shaft c. These frames or arms are provided with parallel guide rods I, upon which the weights are mounted and freely movable radiallyy with relation to said shaft, the outer ends m of said frames or arms serving as stops to limit the outward movement of the weights. The springs y' are shown as adjustably connected with the weights by threaded bolts n provided with nuts for regulating the tension of the springs and Varying the position of the weights with 'relation to the shaft e.

The machine operates as follows: In start.n ing, the weights being held by the springs j at the inner limits of their movement, or close to the shaft c as shown in the drawing, have the least centrifugal eli'ect upon the shaft c, which tends to rotate about its own axis, but as the speed of the shaft increases, the weights are gradually moved away from it 'against the tension of the springs by increasing centrifugal force, and as they more outwardly, their centrifugal etl'ect ou said shaft increases, causing it, with theloosely suspended case or frame in which it turns, to gyrate in a gradually enlarging circuit. When the shaft 'c attains its full normal speed, the outward movement of the weights is arrested by the springs or by the stops m, and the case or frame L with its load gyrates about its center of gravity, which is determined or modified by the position of the weights. In moving away from the shaft c as its speed increases, the weights z' gradually shift the center of gravity of the machine away from the axis of the shaft c, thereby gradually increasing its gyratory orbit' or circuit and avoiding the erratic movements and consequent shock and jar t0 the machine and .its sup orting connections which would take place if the weights werev permanently set to produce the normal gyratory circuitand the-shaft c was unconfined. ln stopping, as the speed of the sha ft e and the centrifugal force of the weights e' are reduced, said weights' are gradually moved inwardly by the springs toward said v a stop, a weight movabl shaft, thereby diminishing their centrifugal efl'ect thereon and consequently the gyratory orbit or circuit of the machine until ltfnally comes to rest, vthe Weights assuming their initial positions, as shown in the drawing.

The construction and arrangement of the shifting weights, their connections with the shaft c and the springs or yielding resistnces may be mo'ditied in various ways without materially affecting their mode of operation and without departing from the principle and intended-scope of the invention.

I claim:

l. In a g ratory machine the combination with a free y suspended member capable of gyratory movement in an approximately horizontal plane, of a vertical rotary shaft centrally journaled in said member and provided with aradially disposed guide having mounted on said guide between said sha t and stop, and a spring located on the opposite side of the weight from the stop and tending to move the weight toward said shaft, substantially as described.

2. In a gyratory machine the combination with a 'freely suspended member capable of gyratory movement in an approximately said shaft, and means for adjusting the tension of said spring independently of said stop, substantially as described,

3. In a gyratory machine the combination with a freely suspended member capable of gyratory movement in an approximatel horizontal plane, of a vertical rotary sha .t

ournaled centrally in said member and provided adjacent to its upper and lower ends with radially disposed guides having stops at their outer ends, centrifu al weights movably mounted on said gui es between said shaft and stops, and springs located on the opposite sides of the wei hts from the stops and tending to move te weights toward said shaft, substantially as described.

In witness whereof I hereto affix my signature in presence of two witnesses.

JOHN FRASER. Witnesses:

CHAs. L. Goss, BERNARD C. Ronorr.

LIU 

